Abstract
Mass spectra of trimethylsilyl derivatives of a series of homogeneous cerebrosides have been recorded. The compounds studied had a d-galactopyranose in β-glycosidic linkage to different ceramides (containing dihydroxy or trihydroxy long-chain base and normal or hydroxy fatty acid). The composition of some fragments was established by high resolution analysis. Molecular ions were found for all compounds ( m/e 863–1265). Fragments of the silylated hexose were of relatively low intensity (at m/e 451, and 451 minus trimethylsilanol at m/e 361). Specific fragments of medium intensity were obtained from primary cleavage of the long-chain base and of a hydroxy fatty acid. Two rearrangement ions were specific for the fatty acid. Fragments of the base plus fatty acid were also obtained. Trimethylsilyl derivatives should therefore be useful in the analysis of long-chain bases and fatty acids and combinations thereof in natural mixtures of cerebrosides.
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